Someone has found the manual to Sun's Ultra 40 - which hasn't even been announced yet. The machine clearly is the bigger brother of the Ultra 20. It apparently sports two AMD Opteron processors (single or dualcore; 2.0Ghz or faster; 1MB cache), eight PC3200 DIMM slots (2GB per DIMM), and more. It will come pre-loaded with Solaris 10 (obviously) but RedHat/SUSE Linux Enterprise/Windows are also supported, in both 32bit and 64bit.